Contracts that use as little calldata as possible in order to save gas on L2s.
Layer 2 networks share security with mainnet by posting transaction calldata to Layer 1. As a result, Layer 2 users pay their portion of the mainnet gas costs when executing transactions. Layer 1 gas can be >25,000x more expensive than Layer 2 gas, so paying for calldata dominates L2 transaction costs. With custom contracts that use less calldata than standard methods we significantly reduce transaction costs for users.
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